The next set to be released after the Lost desert is The Darkest Faerie! It will have to to with the video game they are realeasing on the PS2 this year, and it will have a plot for it online! Here's a scoop on it, and credit goes to me!

Banished for a thousand years, The Darkest Faerie™ has been released. And when bad things start to happen all across Neopia, even Fyora, Queen of Faeries isn't safe. This enchanting, 150-card expansion introduces magical constellations, original-artsketch cards, the legendary world Altador, and an extra large helping of Faeries. Each 8-card booster pack gives collectors and players alike even more reasons to expand their growing collections of the Neopets™ trading card game.

It sounds really exciting to me!! I'm definitely buying the PS2 game and some of this TCG expansion!